Porto stacks colourful houses above the Douro, linked by Eiffel-style bridges. Cross to Vila Nova de Gaia to tour the port wine lodges, then lose yourself in the Ribeira riverside lanes.
Upstream, the Douro Valley is a UNESCO landscape of terraced vineyards. Take a river cruise or the scenic train, and stop at a quinta for a tasting.
Porto is smaller and more soulful than Lisbon, with superb food, riverside sunsets and a glass of tawny always within reach.